金属元素在生物质一体化制氢中的催化作用研究

发布时间：2018-06-07 08:12

本文选题：生物质 + 热解　；参考：《华东理工大学》2017年硕士论文

【摘要】：本课题组自制的生物质一体化制氢系统通过快速热裂解、气固同步转化、水蒸气催化重整可以有效制取富氢气体。在此工艺基础上,本论文研究主体分为三部分:不同金属元素对一体化制氢系统的影响、K2CO3/CaO在一体化制氢系统的协同作用和生物质炭催化重整生物油模拟物制氢研究。基于生物质一体化制氢工艺,考察了不同金属元素K、Ca、Mg、Fe、Zn对玉米芯废屑制氢过程中氢产率、产品气组成以及碳转化率的影响。结果表明,不同金属元素催化效果依次为KFeMgCaZn,其中K元素的催化效果最为明显。并在此基础上,选择K金属作为添加催化剂,详细探讨了金属元素对热解及气化过程的影响,结果表明,添加K金属能够促进生物质的热解和气固同步转化过程。当热解温度600℃及气固同步转化温度850℃时,潜在氢气产率和碳转化率达分别86.97g/kgbiomass和90.11%。对K2C03和CaO在一体化制氢中作用进行研究,发现提高进料中K2C03和CaO的含量都有助于提升一体化制氢效率。K2CO3有助于提高制氢系统的碳转化率,而CaO可以显著改变热解和气化后产品气组成分布,提高氢气浓度。研究还表明,添加K2CO3/Cao共同促进了在生物质一体化制氢系统,气固同步转化温度为850℃时,达到最高的氢气产率81.41g/kg biomass 和碳转化率 91.58%。研究添加K2C03生物质热解后获得的生物质炭(K-biochar)作为催化剂对生物油模拟物重整制氢的影响,并对工艺条件进行了考察,结果表明较高的温度,适宜的S/B和WH SV有利于氢产率提高,即在温度为900℃,水碳比为3,WHSV为1h-1的时候有最大氢产率87.12%和最大氢浓度73.68%。K-biochar有较好的催化活性,相比无添加剂热解后生物质碳(Raw-biochar)的实验氢产率提升了 11.99%
[Abstract]:On the basis of this technology, the main body of this paper is divided into three parts: the influence of different metal elements on the integrated hydrogen production system, and the synergy of K2CO3/CaO in the integrated hydrogen production system. Effect and catalytic reforming of biomass carbon for hydrogen production of bio oil simulants. Based on the integrated hydrogen production process of biomass, the effects of different metal elements K, Ca, Mg, Fe, Zn on hydrogen production, product gas composition and carbon conversion in the process of hydrogen production from waste chips were investigated. The results showed that the catalytic effect of different metal elements was KFeMgCaZn, including K yuan. On this basis, the effects of metal elements on the pyrolysis and gasification process are discussed in detail on the basis of the selection of K metal as a catalyst. The results show that the addition of K metal can promote the pyrolysis of biomass and the synchronous conversion process of gas solid. When the temperature of pyrolysis is 600 and the gas solid conversion temperature is 850, the potential hydrogen can be found. The gas yield and carbon conversion rate are 86.97g/kgbiomass and 90.11%. respectively. The effect of K2C03 and CaO on the integrated hydrogen production is studied. It is found that the increase of K2C03 and CaO content in the feed can help to improve the integrated hydrogen production efficiency.K2CO3 can help to improve the carbon conversion rate of the hydrogen production system, and CaO can significantly change the composition of the product gas after the pyrolysis and gasification. The study also showed that the addition of K2CO3/Cao to the biomass integrated hydrogen production system, when the gas solid synchronous conversion temperature was 850, reached the highest hydrogen yield 81.41g/kg biomass and carbon conversion rate 91.58%. to study the biomass carbon (K-biochar) obtained after the pyrolysis of K2C03 biomass (K-biochar) as a catalyst. The effects of the reformer and the process conditions were investigated. The results showed that the suitable S/B and WH SV were beneficial to the increase of hydrogen yield, that is, the maximum hydrogen yield 87.12% and the maximum hydrogen concentration 73.68%.K-biochar have better catalytic activity when the temperature is 900, the water carbon ratio is 3, and the WHSV is 1H-1. The hydrogen yield of biomass carbon (Raw-biochar) increased by 11.99% after pyrolysis.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ116.2

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